Please help me id this creature

[crankthecar]

Hi this is the second time I found this creature in my tank can someone please id is it a danger to my corals ? Also I found some weird white spots in my tank is that the eggs for that creature or is it something else

 

[RedFrog211]

Definitely a nudibranch- is there any way you could get a better picture of its back? That would help ID the species

 

[Jeffo.it]

It Is impossible to identify it with this pic

 

[crankthecar]

I took it out already

 

[vetteguy53081]

Good. It was an Arminid sea slug (Arminia spp.) which are predatory on soft corals.

 

[tapeworm123]

Note to self any thing that you didn’t add remove and I’d later better safe then sorry